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Cluster Plasmonics: Dielectric and Shape Effects on DNA-Stabilized Silver Clusters
Stacy M Copp1, Danielle Schultz2, Steven M Swasey2
1Department of Physics, University of California , Santa Barbara, California 93106-9530, United States.
Nano Letters
|May 18, 2016
Summary
DNA-stabilized silver clusters (AgN-DNA) exhibit collective electronic excitations. Their optical properties are sensitive to the dielectric environment, indicating potential for nanoscale sensing applications.
Area of Science:
- Nanomaterials Science
- Physical Chemistry
- Biophysics
Background:
- DNA-stabilized silver clusters (AgN-DNA) are fluorescent nanomaterials with unique optical properties.
- Understanding their electronic excitations is crucial for developing novel applications.
Purpose of the Study:
- To investigate the influence of dielectric environment and cluster shape on AgN-DNA electronic excitations.
- To assess the potential of AgN-DNA for sensing changes in their local environment.
Main Methods:
- Application of classical Mie-Gans (MG) theory to model AgN-DNA optical properties.
- Experimental measurement of wavelength shifts upon addition of glycerol to probe dielectric sensitivity.
Main Results:
- MG theory accurately predicts plasmon wavelengths for linear silver chains, even for small clusters.
- AgN-DNA exhibit collective excitation processes with effective thicknesses of ~2 silver atoms and aspect ratios of 1.5-5.
- Observed wavelength shifts in glycerol are smaller than for larger gold nanoparticles but detectable due to narrow linewidths.
Conclusions:
- AgN-DNA optical properties are governed by collective electronic excitations.
- AgN-DNA demonstrate sensitivity to dielectric environment changes at the nanoscale (~1 nm).
- These findings suggest potential for AgN-DNA in fluorescence-based sensing applications.
